Good evening, everyone. I'm Jeremy Price, MicroStrategy Senior Vice President of Financial Planning and Analysis and Head of Investor Relations. I'll be your moderator for MicroStrategy's 2021 second quarter earnings webinar. Before we proceed, I will read the safe harbor statement. Some of the information we provide during today's call regarding our future expectations, plans, and prospects may constitute forward-looking statements. Actual results may differ materially from these forward-looking statements due to various important factors, including risk factors discussed in our most recent 10-Q filed with the SEC. We assume no obligation to update these forward-looking statements, which speak only as of today. During today's call, we will refer to certain non-GAAP financial measures. Reconciliation showing GAAP versus non-GAAP results are available in our earnings release and presentation, which were issued today and are available on our website at www.microstrategy.com.
I would like to welcome you all to today's webinar and let you know that we will be taking questions using the Q&A feature at the bottom of your screen. You can submit questions throughout the webinar, and Michael or Phong will answer them at the end of the session. Please be sure to provide your name and your company's name when submitting your questions. With that, I will turn the call over to Michael Saylor, Chairman and CEO of MicroStrategy.
Thank you, Jeremy. I'm Michael Saylor. I'm the Chairman and CEO of MicroStrategy. I'd like to welcome all of you to today's webinar regarding our 2021 second quarter financial results. I'm here with Phong Le, our President and Chief Financial Officer. First, I'd like to pass the floor to Phong, who's going to provide an update on our operations and finance for the quarter.
Thank you, Michael. I'll start with some highlights from our second quarter performance. MicroStrategy performed well across the board, demonstrating continued momentum in our business analytics software business, while also completing another successful capital raise that extended our digital asset holdings. We built upon our strong first quarter performance and have now delivered two of the strongest quarters of operational performance in years. We're pleased with the strength and consistency of our execution as we continue to benefit from the numerous product introductions we've made since 2019 and the operational changes we undertook in the first half of 2020. Total revenue in the quarter grew 13% year-over-year or 10% on a constant currency basis. It was up 6% versus Q2 of 2019, which is our strongest Q2 quarterly performance in six years. Our cloud offerings continue to gain traction with both new and existing customers.
While we once again got some benefit from a favorable comparison against the COVID-19 impacts during Q2 of 2020, our performance shows clear momentum across our entire business. License revenue grew 50% year-over-year, but more impressively, grew 10% versus the second quarter of 2019. Subscription revenue in the quarter was up 29% compared to Q2 2020. Current subscription billings grew 13%, our fifth straight quarter of double-digit growth. Our Q2 subscription billings were impacted by a decrease in short-term deferred subscription revenue, as we no longer include contract values that are invoiced in the future. Without this decrease, Q2 subscription billings would have grown 42%. We had another strong quarter of profitability with a non-GAAP operating margin of 17%, up 10% year-over-year. Our performance is being driven by broadening adoption of the MicroStrategy platform.
Existing customers have long recognized the value of MicroStrategy, looking for more areas to deploy our best-in-class BI platform. New customers are also attracted to our solutions, recognizing the need for more robust capabilities than those offered by lightweight dashboarding tools from unproven competitors. Customers are well aware that legacy vendors like IBM and SAP have deprioritized BI in favor of their respective cloud transitions, thus, as enterprises look to rebuild applications for the modern world, MicroStrategy's modern, open, enterprise-grade platform better meets their needs. We are pleased with the market reception of HyperIntelligence and Hyper.Now. We signed several dozen HyperIntelligence customers in the quarter, as its modern and intuitive design puts actionable insights into workers' hands instantaneously. Let's look at a few key wins in more detail.
We signed a net new win with a German freight company where we beat Tableau and Power BI to displace a legacy solution. We signed a new win with a leading cloud communications vendor for a seven-figure OEM transaction where we beat Tableau and Microsoft Power BI. Finally, we signed a new license deal with one of the leading cryptocurrency exchanges. We also saw an increase in migrations of existing on-premise customers to our cloud solution, which also included an expanded deployment of MicroStrategy as part of the migration process. We had several wins in the quarter where ARR from that customer more than doubled from its prior run rate, providing value both to the customer and MicroStrategy.
Some exciting conversions during the quarter included, one, a leading clothing retailer in the U.S. who nearly doubled the size of their annual commitment to us and is now approaching $1 million in ARR. Two, a sizable expansion with one of the world's largest beverage producers, extending its MicroStrategy deployment to now include collaboration and federated analytics features as part of its migration to the cloud. Three, one of Europe's largest grocers signed a multimillion-dollar expansion to further expand MicroStrategy as its enterprise standard BI platform. Another exciting area of strength for us is our embedded OEM business, where we are number one in the market. We have seen increased interest from new and existing customers that want to leverage our best-in-class analytics platforms as a core part of their solution. We experienced notable growth in both the number and size of OEM opportunities.
We believe our extensive investment in open architecture, driven by open APIs and SDKs, provides OEMs with the best solution in the market. Our success in the market has been driven in large part by the investments we've made and continue to make in our solutions. Even as we significantly enhance the overall profitability of the company, in 2021, we expect our R&D investment to be the highest on an absolute dollar basis since 2014. As we look into the future, we expect R&D spend in 2022 and beyond to be even higher. Our investments in cloud, OEM, security, in modernizing our UI through Workstation, Dossier, Library, and HyperIntelligence are a reflection of our commitment to offer our customers the most complete business analytics platform in the world.
A key part of our strategy is to leverage the virtual wave to drive greater efficiency in our go-to-market efforts, which enhances our overall profitability and provides additional resources to invest in R&D. For example, product license revenue grew 10% since Q2 2019, and subscription revenue has grown 46% over that time, while we reduced sales and marketing expense by $8 million, or 16%, over that same time. Our performance over the last year has validated our decision to move to a fully virtualized go-to-market model at the beginning of COVID. We believe we can continue to generate additional leverage from our sales and marketing spend over time, while continuing to generate consistent top-line growth. Turning now to our digital asset strategy. We had several exciting developments in the second quarter.
First, we surpassed the 100,000 Bitcoin mark, ending the quarter with approximately 105,085 Bitcoins purchased at an average price of approximately $26,080. During the second quarter, we acquired an additional 13,759 Bitcoins for $529 million, or approximately $38,467 per Bitcoin. The capital used for our latest Bitcoin purchase included proceeds from our successful $500 million upsized senior secured note offering that we priced during the quarter. This is our third successful capital raise, with total gross proceeds of $2.2 billion. It is important to note that during the quarter, we created a new subsidiary, MacroStrategy LLC, that was formed to hold the approximately 92,079 Bitcoins we owned prior to the senior notes offering. Additionally, we recently put in place an at-the-market shelf registration to sell up to $1 billion of Class A common shares. We've not executed on the shelf and intend to be opportunistic going forward.
We will continue to evaluate opportunities to raise additional funds across the capital structure to execute our Bitcoin acquisition strategy. Bitcoin prices were volatile in the quarter, resulting in a GAAP non-cash impairment charge of $484.8 million. Our calculation of the non-GAAP market value of our Bitcoin holdings as of June 30th was approximately $3.7 billion, compared to a cost basis of $2.7 billion and book value of $2.1 billion. As of July 28th, 2021, at 4:00 P.M. Eastern Time, the market price of one Bitcoin on our principal market was approximately $40,416, which equates to a non-GAAP market value roughly $4.2 billion for our 105,085 Bitcoins, a 56% appreciation over our cost basis. We intend to continue to deploy additional capital into our digital asset strategy.
As one of the leading advocates for digital assets, we've been working with peer companies and various policy-setting agencies in the U.S. to try to determine a more appropriate accounting framework for digital assets. As the largest corporate holder of digital assets in the world, we believe we have a responsibility to share what we've learned since embarking on this strategy to make it easier for other companies to diversify their balance sheet with this new asset class. Before going into a more detailed review of our financial performance, let me just finish by saying how pleased we are with our performance in the second quarter, the first half of 2021, and the last four quarters since the primary impacts of the pandemic. We are delivering on both of our strategic priorities.
Operationally, we're realizing the benefits of the investments in the enterprise analytics software business, which is leading to both improved revenue growth and increased profitability. Our operational success leaves us well positioned to deliver on the long-term financial targets laid out in our Investor Day last November. At the same time, our digital asset strategy has generated substantial value for shareholders and elevated MicroStrategy to a global leader in the Bitcoin market. The increased visibility of the company due to our digital asset strategy is also helping to initiate sales cycles we would have been unlikely to participate in otherwise. We believe we are in the early stages of each of these trends, and that there continues to be meaningful opportunities for further improvement in both of our strategic focus areas.
Turning to our second quarter 2021 financial results in more detail, GAAP revenues for the quarter were $125.4 million, up 13% year-over-year and up 6% from the second quarter of 2019. Product license revenues were $22.2 million in the second quarter of 2021, up 50% year-over-year and up 10% from the second quarter of 2019. Subscription services revenues in the second quarter of 2021 were $10.3 million, an increase of 29% year-over-year and up 46% from the second quarter of 2019. The growth in subscription services revenue reflects the growing portion of our product bookings that are related to our managed cloud platform. Our current subscription billings are $10.6 million, an increase of 13% from the second quarter of 2020. We are pleased with the performance of our cloud business in the quarter.
Product support revenues were $71.0 million in the second quarter of 2021, a 1% increase year-over-year. The year-over-year increase was primarily driven by favorable impact of foreign currency translations, partially offset by certain existing customers converting from perpetual licenses to our subscription services or term license offerings. Product support revenues were down 2% year-over-year on a constant currency basis. As we see more on-premise conversions to our cloud offering, we would anticipate product support revenue will experience a modest decline over time. Finally, other services revenue, which largely reflects our consulting services, were $21.8 million in the second quarter of 2021, an increase 23% year-over-year. Improvements in consulting revenues is an indication of continued engagement from our customers to modernize and expand deployment of their MicroStrategy platform. Total deferred revenue on June 30th, 2021 was $190.1 million.
This is up 10% year-over-year, primarily due to a 48% increase in deferred subscription services revenues, and a 6% increase in deferred product support revenues. As we see more existing customers converge to our managed cloud platform, there is a shift from deferred product support revenues to deferred subscription services revenues. Total GAAP expenses were $539.6 million in the second quarter of 2021, which includes a digital asset impairment charge of $424.8 million. Our Bitcoin holdings are considered indefinite-lived intangible assets under applicable accounting rules, meaning that any decrease in their fair value below our book value for such assets at any time subsequent to their acquisition requires us to recognize impairment charges. Total non-GAAP expenses were $103.7 million in the second quarter of 2021, a 2% increase year-over-year.
The year-over-year cost increase is mainly driven by better sales performance, which resulted in higher variable compensation for sales and marketing. Total GAAP operating loss was $414.2 million in the second quarter of 2021, inclusive of impairment related to Bitcoin of $424.8 million and stock-based compensation expense of $11.1 million. Total non-GAAP operating income was $21.6 million in the second quarter of 2021, a $13.1 million increase year-over-year. Turning to the balance sheet, we ended the quarter with $56.4 million in cash. We issued $500 million in aggregate principal amount of senior secured notes bearing an interest rate of 6.125%. The net proceeds from the sale of the notes were approximately $487 million after deducting the initial purchasers' discounts and commissions and customary offering expenses.
In accordance with the company's corporate strategy of acquiring Bitcoin, we used the net proceeds from the sales of the notes to purchase Bitcoin. The carrying value of our Bitcoin holdings as of June 30th, 2021 was $2.1 billion, which reflects a $689.6 million cumulative impairment charge that is also reflected as a loss on our GAAP income statement and in the period incurred. We exclude the quarterly impact to Bitcoin impairment charges from our non-GAAP operating income and non-GAAP diluted earnings per share calculations. We estimate the non-GAAP market value of our Bitcoin holdings was $3.7 billion at June 30th, 2021, reflecting $1.6 billion of unrealized gains when compared to the carrying value of our Bitcoin at June 30th, 2021. We are pleased with the execution of our two corporate strategies over the last four quarters.
On a trailing 12-month basis, we've generated revenue of approximately $507 million, which represents 7% growth year-over-year. Our software businesses generate a non-GAAP operating income of $90 million on a trailing 12-month basis, which equates to a non-GAAP operating margin of 13%. As a result of our strong financial performance, the company is raising our estimate of 2021 non-GAAP operating income to $80 million-$100 million. Additionally, over the last four quarters, the company has acquired over 105,000 Bitcoins, with estimated appreciation of approximately 33% over the acquisition cost. Going forward, you should expect that we may purchase additional Bitcoin when our cash equivalents, and short-term investments exceed current working capital requirements. We may, from time to time, subject to market conditions, issue debt or equity securities in capital-raising transactions with the objective of using the proceeds to purchase Bitcoin.
Finally, we plan to engage in a search for the company's next CFO. With the management team focused on two corporate strategies, growing our enterprise analytics software business and acquiring and holding Bitcoin, and with the increase in our public profile and operational complexity, we plan to engage in a search for a CFO to complement the management team and allow me to focus on my role as President, running the day-to-day business of MicroStrategy. I'll now turn the call over to Michael for comments on our Bitcoin acquisition strategy, as well as market trends for business intelligence software and our executive team.
Thanks, Phong Le. Well, I'd just like to start by reiterating the company has two strategies. The MicroStrategy software mission is to make every enterprise a more intelligent enterprise via our business intelligence software platform. Our strategy and plan with regard to that is make all of our functionality available on demand via the cloud, make it easier for all of our customers to upgrade to the cloud, make our business intelligence software faster, better, smarter, stronger. We're well-positioned to do that because that's our singular operational focus. With the exception of just a few people in legal and finance, the entire company is focused upon enterprise business intelligence. That is our micro strategy. We have a second strategy, as you know, a macro strategy. Our macro strategy is to acquire and to hold Bitcoin.
Our plan with regard to that, of course, is to continue to acquire Bitcoin, continue to hold Bitcoin. It's a very straightforward strategy. Along the way, we'll be educating the world with regard to the benefits of digital property. We'll advocate Bitcoin and the benefits of the technology to corporations like ourselves, to institutional investors. We'll help explain Bitcoin to regulators, to the public, to the media. That will keep us busy, I believe. MicroStrategy, MacroStrategy. Pursuant to our MacroStrategy, this quarter, we did complete that $500 million senior secured debt offering. That was a big deal. We're very excited about it because it was a seven-year senior note. It's bearing interest at 6.125% interest. We thought that was a very favorable interest rate for a very favorable timeframe.
We were able to purchase 13,005 Bitcoin using the proceeds of that debt offering, and we did that around $37,617 a Bitcoin. We thought that was a good price, and the reason that we did that deal was we thought that that was a deal that would be accretive to the other classes of our security holders, and it presented itself at that particular time. As Phong noted, in the entire quarter, we were able to acquire more than that, more than 13,005 Bitcoin. We acquired 13,759 Bitcoin at a slightly higher average price, $38,467. We're very comfortable with that acquisition. I was very pleased to see us making such good progress and ending the quarter with 105,085 Bitcoin. At this point, we've now invested $2,741,000,000 in Bitcoin.
For those of you who have followed me, you know that I believe Bitcoin is digital property, and it's the equivalent of digital gold on a big tech network. Calling it digital gold really understates it. Digital property is a bit better. The ability to convey billions of dollars of value at the speed of light and to program it, and the fact that that digital property has an open protocol that any company can write to, makes it a very special thing, a very disruptive technology for this decade. We think that acquiring Bitcoin at this time is going to be a wise strategic move. There will never be more than 21 million Bitcoin, and we feel like there's a land grab right now to acquire as much as you can because Bitcoin represents a macroeconomic solution to those that want a non-sovereign store of value.
It also represents a technology solution. It's a technical solution to mobile companies like an Apple or a Google or a Facebook, because they could implement digital property right into their mobile apps. PayPal and Square have been extraordinarily successful by doing this. It's also a technical solution to energy companies, because if you have stranded geothermal or stranded renewable, or if you have nuclear power, or if you have any kind of generator, stranded natural gas, or any kind of energy capability that's running at less than 100% utilization, you can monetize that stranded energy, or you can recycle that wasted energy using Bitcoin mining. Bitcoin is a compelling technical solution for the energy industry. It's a compelling technical solution for big tech. It's a compelling macroeconomic solution.
Because it's so decentralized, you have millions and millions of people thinking about how they can add value to Bitcoin and how they can use Bitcoin to add value to their own businesses. A few general views on the Bitcoin industry right now. The China exodus dominated the news in Q2. I think the China exodus was a really good thing for Bitcoin. The result was a decentralization of Bitcoin mining throughout the world. Bitcoin mining is really the Bitcoin security network. The decentralization of the Bitcoin security network everywhere in the world made Bitcoin more secure and made Bitcoin more decentralized. The China exodus was also a good thing because it decentralized Bitcoin holdings, and you saw a general shift of the nexus of Bitcoin holdings and Bitcoin mining from the East to the West and diffused throughout the entire rest of the world.
I think that long-term, the Westernization of Bitcoin is going to be good for Bitcoin. I think it's good for the U.S. dollar. I think it's good for U.S. technology. It's good for Western technology. Generally, what we're seeing is that Bitcoin is now aligning with the big tech networks from Amazon, from Apple, from Google, from Facebook, right? These are very, very powerful, dominant digital networks. Whereas they have grown to dominance by offering digital music and digital retail and digital books and digital communications, now we have something new, digital property, that is aligning on the Bitcoin network with all of these other Western networks. It's a good thing. Capital is flowing into Bitcoin in the second quarter. We saw this in the form of Bitcoin miners coming public. There are lots of Bitcoin miners that are either public or coming public.
It's going to be a continual trend in the coming six months. It's an exciting trend because a network of a dozen to two dozen publicly traded companies that are securing the Bitcoin network are going to be beneficial to the asset class. They're bringing financial capital to Bitcoin. They're bringing political capital to Bitcoin. They're bringing technical capital to Bitcoin. They're bringing human capital to Bitcoin. They're bringing a lot of credibility to the entire digital property network that is Bitcoin. We saw many constructive developments with Bitcoin investors in the second quarter. More large banks in the Western world are supporting Bitcoin. Large exchanges are supporting Bitcoin. We see an expansion in the on-ramps. We see more institutional investors supporting Bitcoin funds, Bitcoin ETFs being applied for, more adoption of, and more acceptance of Bitcoin throughout mainstream finance and also mainstream media.
I think if we look at Bitcoin adoption at the individual level, probably one of the most exciting pieces of news that I've seen is the result of the Crypto.com survey that just came out today, and that showed there to be 114 million individual holders of Bitcoin as of, I think, the end of June, maybe the end of May or June, in that range. We're adding about 2 million more Bitcoin holders per week. If you think about adding 2 million a week and breaking through 114 million, these are just incredible numbers. I pointed out, that makes Bitcoin the most widely held financial asset in the world, in the history of the world, growing at the fastest rate. That's just an extraordinary thing, right?
You can't point to 114 million holders of any stock, any bond, any particular type of instrument, in the same way that you see this with Bitcoin. I think that we're going to see this trend continue. All of these things are good for Bitcoin. If we add the last observation, which is, I think it's becoming clear that Bitcoin is here to stay based upon mainstream media coverage and more and more regulators are taking an interest in Bitcoin. I interpret it as a positive. I think there is an enthusiasm and an awareness that we need to support crypto and Bitcoin in the regulatory frameworks throughout the Western world. I think that that's going to drive a lot of constructive activity and constructive dialogue, which is going to institutionalize this asset class even further.
As we make more progress with regard to all of these developments, I think that institutional investors get more comfortable holding Bitcoin. As they get more comfortable holding Bitcoin, I think it's only good for the asset. With that, I'd like to switch my conversation to software industry trends. The big software industry, the big players in software that we have traditionally competed against, they're starting to shift their focus to creating cloud platforms that they can use to offer open cloud services that might compete with AWS and Azure. I think that has reduced their focus upon their business intelligence divisions. I think in general, they're under pressure to grow due to the macroeconomic environment.
Because the big full stack software vendors are under that kind of pressure to grow, they'd have to look at making huge investments in new areas that are risky, or they have to look at dilutive acquisitions or expensive acquisitions in order to grow their top line. They don't have the strategy we have of holding Bitcoin to cure that on their balance sheet. Because we have Bitcoin, we don't need to engage in a series of acquisitions to keep the top line growing more than 20% or 25% a year. We can focus upon our core business, and I think that that's really good. It's very important. I think you see that our results and our growth this quarter is because we are focused upon the core business intelligence business, and we're able to become a best-of-breed business intelligence company.
I'm really excited by our results in Q2. Top line growth, 13%. Bottom line growth, 153% for our non-GAAP operating income year-over-year. 17% non-GAAP operating margin is very healthy. Our subscription revenue is up 29%. This is a really strong number. Our non-GAAP EPS, $1.72 a share versus analyst estimates that were about $0.98 a share. Substantial beat on the bottom line, and that's $1.72 a share versus $0.60 a share last year. Needless to say, we're pleased with the non-GAAP EPS results. As Phong pointed out, it's our best second quarter in six years. During that quarter, the CXO team worked like a well-oiled machine. I don't really think the senior management team's ever worked better. The gears are all humming. We have decided to pursue a CFO search, and we're doing that to allow Phong to focus more on the presidential role.
Obviously, we've got a lot of ambition on our plate. We're excited about continuing to grow the enterprise software business aggressively. We're also very excited about our Bitcoin strategy. By adding this one more role to the management team, it'll allow us to maximize that opportunity. With that, I guess I'll go ahead and open up the floor to questions from the analysts and the investors. Jeremy?
Thank you, Michael. We're going to jump right into questions. The first question is for Phong. First, congratulations on the great quarter. Have you seen any changes in the competitive landscape, and what impact do you expect the consolidation of BI and visualization tools will have on your business in the coming years? You're on mute, Phong.
Sorry. Rookie move. I was on mute there. Thanks, Jeremy. It's a good question. Thanks. We did have a really good quarter. We're excited about it. I do think the changes in the competitive landscape are part of what's impacting the quarter. I mentioned a few of them, Mike mentioned a few others. Some of the really large legacy BI vendors, SAP BusinessObjects, IBM's Cognos, Oracle's OBIEE. We all know those companies are really focused on transitioning their own businesses to the cloud, competing with Google and competing with AWS and Azure, they've de-invested in their BI platforms. We're seeing an increasing pace of the inquiry and execution of migration off of those legacy BI platforms. In the case that companies are looking to do that, especially large enterprises, we're the logical answer because they're looking for a full-scale enterprise platform.
That's what those Cognos, SAP BusinessObjects are. That bodes well for us. The other thing that we're seeing on the lower end is some of the newer entrants into BI in the last five years that have very niche solutions and were not well capitalized, started to get weaker in the last three years, and especially with COVID and pressures on capital structure, we saw them get even weaker and either get bought or start to wither. In that case, we weren't competing with them directly, but we were competing with their mind share, right? With fewer players and with more consolidation, it tends to be a good thing for us. We saw this cycle in 2008, and we came out of that very strong and growing, and I think we're seeing something similar now.
As long as we stay focused on the customer and focused on our product, I think we can continue to grow based on some of those trends that we're seeing. Over the next few years, if the trends continue, that's good for MicroStrategy.
Thanks, Phong. All right. The next couple questions we'll turn to Michael. The digital asset environment continues to evolve rapidly. A couple of questions. First, wondering if you have a thought about diversifying across other digital assets, such as Ethereum, instead of staying focused on Bitcoin.
Our strategy is to focus upon Bitcoin. We think that Bitcoin is digital property, and digital property, in our opinion, is the most compelling technical opportunity of the decade. Digital property means that 8 billion people with a mobile phone can carry their property around on a mobile phone. Digital property is a $1 trillion opportunity for Apple, for Google, for Facebook, for Amazon. Digital property is the solution to the cybersecurity problem and the trust problem across billions and billions of people. Digital property is going to allow 100 million companies to trade with each other on an open protocol at the speed of light. Bitcoin is a compelling solution, if not the compelling solution. The other crypto assets and digital assets have their own places. After digital property, you've got digital currency, but digital currencies aren't really an investment strategy.
They're really just a medium of exchange in the crypto universe. Holding digital currency is just like holding U.S. dollars. It's not a strategy for investment. You have digital platforms like Ethereum, and you have digital applications like the decentralized exchange, Uniswap, or something on top of Ethereum. Those are different businesses, but they are, in essence, businesses that have to compete in a market, and you have to consider the digital currencies are competing against existing currencies. The platforms, the decentralized platforms, are competing against centralized platforms. The decentralized applications are competing against centralized applications. When I look at all those, I think there's competitive risk, there's technical risk, there's regulatory risk, there's a lot of uncertainty, there's a lot of moving parts, and they're completely different businesses.
Just because one is involved in Bitcoin doesn't mean that it makes sense to consider the other crypto assets. We don't have any intention to get involved with other digital assets or other crypto assets. We're going to stay focused. I guess I'll make one more point here. There are two ways to see the world. If you look at the evolution of the crypto economy, and if you ask, what's the crypto opportunity? One way to see the world is I take Bitcoin, I create digital property, and I plug it into Apple, Amazon, Facebook, Google. I plug it into every insurance offering. I plug it into every mutual fund, into Fidelity, into BlackRock, into PIMCO. I plug it into every product, every device, every service, every operating system. I plug it into iOS, and I plug it into Android, and I plug it into Windows.
I plug it into the cloud. I plug it into AWS. I plug it into Azure. You see, I can plug the Bitcoin digital property into the entire traditional economy, all of it, and it makes everything better. In theory, if you're a big tech company and you plug into Bitcoin, you could generate $1 trillion of value just by plugging into Bitcoin. That vision of the world is Bitcoin fixes everything. Bitcoin is a benefit to every governor, every mayor, every CEO, every product, every service. Everything can be improved by building Bitcoin into it. Right? That's one view of the world. That happens to be our view of the world. By plugging this open protocol digital property into every corporation, every product, every service, and every government, and every agency in the world, you're going to make them better.
If you believe that and you don't own a country or you don't own a government, you don't own a product, you don't own Apple, you don't own Google, you don't own Facebook, you don't own everything, but you have some assets, you buy Bitcoin. You buy Bitcoin so that when Apple, Amazon, Facebook, and Google build Bitcoin into their product, then you're the beneficiary because you can't afford to buy Apple, Amazon, Facebook, and Google, all of them. That's one view of the world. The other view of the world is the innovation is going to come by creating other crypto asset networks, all these other cryptos, and by innovating in that decentralized area. We don't happen to believe that, right? Our belief is that the extraordinary value creation activity or opportunity comes simply by plugging Bitcoin into your balance sheet.
If the city of New York raises $1 billion and buys Bitcoin, it fixes the balance sheet of the city of New York. It happens overnight. It happens not with any more technical innovation. It happens through financial integration. That's why we pursue the strategy we pursue. It's a property strategy. If there are compelling platforms and applications in the crypto universe that manage to build on top of Bitcoin, then they will benefit. Bitcoin will benefit. If there are compelling applications in the traditional CeFi world, traditional banks, traditional governments, and then big tech companies, then Bitcoin will still benefit. We don't wish to express a general opinion or take an investment risk with regard to which platform, which application, and which use case of Bitcoin will be most successful.
We think that the least risky, most diversified investment strategy is to simply hold Bitcoin. I know that sounds complicated. People think you should diversify to decrease risk. Well, we believe we are diversified because as long as we hold the Bitcoin, any of 100,000 other corporations or 100,000 other technologies that use the Bitcoin will benefit our investment strategy. That's why we do what we do.
Thanks, Mike. One quick follow-up on that one. Clearly, with the financing in Q2, we're exploring the inherent value of Bitcoin on the balance sheet. This person's wondering if you have any updates on how further to use the balance sheet to drive either the core business or help drive the strategy to build our digital asset balance.
Yeah. Well, our view with regard to future balance sheet decisions is we'll take into account market considerations, then we'll look for accretive opportunities that are in the interest of our shareholders. From time to time, we'll find those opportunities.
Thank you, Michael. Phong Le, next question's for you. Why didn't the company issue the $1 billion in equity and buy more Bitcoin?
As I think we're referring to here, we put out a shelf to be able to issue $1 billion in equity. We put that out on September 14th, which is right the day before our quiet period begins, which is September 15th. During that period, until our next open period, we're not able to issue shares in the market.
One more for you, Phong. Subscription revenue growth seems rather modest, especially with continued higher mix in SaaS solutions. How do you feel this is trending against your expectations and around the dozen or so new Hyper customers that are net new or expansion from current customers?
Yeah. Subscription revenues grew 29% year-over-year, which we were pretty pleased with. I think maybe what you're referring to here is subscription billings, which grew 13%. That's five straight quarters of double-digit growth, but it is a decline versus previous quarters. The primary reason for that is in Q2, we no longer include contract values that are invoiced in the future, where we had done that in the past. If we had done the same thing we had in previous quarters, we would have seen subscription billings growth of 42%. It's a bit of a toss-up there, different ways to do that. We thought this would be more conservative on a go-forward basis. If you sort of normalize it, the 42% subscription billings growth was quite strong. Going forward, I think we'll see that level of subscription billings growth.
We still see quite a bit of growth in the cloud business overall.
Thank you, Phong. Michael, back to you. Can you walk through some of the factors you consider when determining future debt or equity raises to purchase Bitcoin? How much room does the business have to raise additional debt or equity to fund Bitcoin purchases? Will MicroStrategy evaluate lending Bitcoin for yield?
We look at a lot of different factors. We look at the market in Bitcoin. We look at the price of Bitcoin. We look at the trading patterns. We look at the history. We look at the outlook. We look at the debt markets. We consider fixed income debt markets and both the liquidity available in those markets and also the outlook for those markets and general interest rates and spreads. We look at the convert markets and trading in the convert markets and the outlook of those markets. We look at our own equity markets and the general software equity markets and the way that our own stock is traded. We look at the futures and the options market for our stock. We look at the futures markets and the derivatives markets for Bitcoin. We consider all of the history.
We try to compile all of the information at our disposal. We think about the outlook for our core business. We look at the technology trends with regard to Bitcoin and how it's being integrated. We look at the macroeconomic trends, what's going on with the macroeconomy, what's going on in the general market. We look at institutional adoption of Bitcoin and institutional views. We look at the status of the Bitcoin mining industry and also the degree of maturity of Bitcoin mining. As Bitcoin miners come public, they're getting better capitalized. As billions of dollars flow into the Bitcoin mining network, that capital is going to change the stock-to-flow ratio of Bitcoin. It's also every single dollar that a Bitcoin miner raises may in fact be a dollar that flows into HODLing Bitcoin.
We try to assess that and the overall regulatory environment and then the FUD that's in our rearview mirror and the FUD that we may think will be in our forward mirror. After we consider all of those things, we ask the question: Is there an accretive activity that we can take? Sometimes the accretive activity would be to buy stock. In August of last year, we announced that we were going to buy our stock back to buy Bitcoin. That was a Dutch auction. Sometimes the accretive activity is to convert existing treasury cash. Sometimes the accretive activity is to sell convertible debt. We've done that twice. Sometimes the accretive activity is to sell senior secured debt, and from time to time, the accretive activity may be to sell equity. That really just depends.
That's a subset of the factors we consider, but you can be sure that we're thinking about it all the time in order to make sure that we act appropriately.
Thank you, Michael. Phong, next question for you. Can you explain the rationale behind creating a separate entity to HODL your Bitcoin?
We created MacroStrategy LLC, other than it being a cool name, we wanted to make sure we had ownership of that, the primary reason was when we issued our secured notes, it was secured against our BI business. We did not need to use our 92,079 Bitcoin that we had at that point in time to secure the debt. We created a separate entity for those 92,079 Bitcoin, as separate to our BI business. That was the primary reason we set it up.
Michael, looking out over the next one to two years, do you expect institutional adoption to be largely led by founder-led, tech-savvy companies? Do you expect companies in other industries with a more diverse set of owners to begin adopting cryptocurrency? What do you think are the next catalysts to drive that broader adoption?
I see institutional adoption coming from macro hedge funds, that actually would have bought gold or would have invested in hard assets or commodities now that Bitcoin is getting on their radar as digital property and the apex digital commodity. Now they've got a multi-year track record of Bitcoin outperforming gold. I think that there's a lot of money that's going to flow from gold funds and investment funds into digital gold, that is Bitcoin. I think that you're seeing a lot of family offices, high-net-worth individuals that are private, having private money. They're starting to see Bitcoin as an interesting investment because it's a generational wealth preservation strategy. If I'm investing to give money to my grandchildren, then I need a very long duration asset. They're operating out of the public eye, but I hear through my back channels a lot of that activity going on.
I think Goldman Sachs did a survey that was published about a week ago, where they indicated there was a lot of interest in Bitcoin from family offices. I think that in terms of public companies, the public companies that you will see embracing Bitcoin most enthusiastically will certainly be the founder-led technology companies, because they have charismatic founders that are risk-takers, that understand technical nuance. The companies that disrupted digital music, digital video, digital movies, digital books, digital maps, digital retail, they had to think differently. If you think different, then once you start thinking different about property and it clicks in your mind that Bitcoin is digital property, then you go from not understanding it to understanding it.
Then there's an, "Oh, crap." moment where you realize that not only do you understand it, but if you don't embrace it and your competitor embraces it, then you're going to be at a massive disadvantage. You wouldn't want to be the last big tech network to integrate digital property into the protocol because Bitcoin turns your billion-user digital communications company into a billion-customer bank in cyberspace. I do think that you will see founder-led tech companies start to embrace Bitcoin. They will do it sooner than other publicly traded companies because they get it and because they need to figure it out for competitive reasons. The example, the big example right now you can see in front of all of us is Cash App. Square's had extraordinary success implementing Bitcoin into their mobile application. That has forced a response from PayPal.
I think, in time, anybody with a mobile application is going to want to use Bitcoin, either to turn themselves into a bank in cyberspace or there's another aspect of Bitcoin, which is it's an international digital value network that allows you to establish trust in cyberspace. If you are Google or Facebook or Amazon or Apple and you have people posting online, you've got a cybersecurity issue. The way that you actually can deploy cybersecurity is plug them into a network like Bitcoin that allows for the rapid interchange of value on an open protocol. If you can implement an open protocol monetary network like Bitcoin, then you can use that to fight denial-of-service attacks, DDoS attacks. You can use it to fight and to ameliorate or attenuate spam. You can use it to shut down hostility and create new degrees of cybersecurity.
I think Bitcoin is really the secret to cybersecurity going forward. This is a really important issue for all of these technology companies. It's also a bank in cyberspace, and so it's the future of financial security and the future of cybersecurity. Those companies can't really afford to ignore that. They would ignore that at their own peril. I think you'll see more with regard to that as time goes on. Then I think the last area of adoption with regard to public companies that will be visible, and I think give it six months, you'll see a lot of it, is you're just going to see an avalanche of publicly traded Bitcoin miners. Every month or every few weeks, there's a new Bitcoin miner that's announcing that they're coming public.
They're either merging with a SPAC, or they're going to do an IPO, or they are public, or they're a public company that's moving from a foreign exchange like the Toronto Stock Exchange to the Nasdaq or the New York Stock Exchange. If you roll the clock back 12 months, it's hard to find any publicly traded company with $1 million of Bitcoin on their balance sheet. Right now, there's a dozen or more with billions and billions of dollars of Bitcoin on their balance sheet. What happens when there's two dozen or three dozen companies and they've all got material Bitcoin exposure because they have to? I think that that's going to catalyze a lot of maturity of the asset class.
Thanks, Michael. We are at time, I'm going to turn it back to you for closing remarks. Michael, closing remarks from you.
Oh, sorry.
That's okay.
Yeah. Okay. I want to thank everybody for being with us for our Q2 2021 financial results webinar. We appreciate your support. To all of our shareholders, we couldn't do it without you. I will look forward to speaking with all of you again in three months. Until then, take care.